/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.tomcat.util.modeler;

import javax.management.MBeanNotificationInfo;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReadWriteLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;

/**
 * <p>Internal configuration information for a <code>Notification</code>
 * descriptor.</p>
 *
 * @author Craig R. McClanahan
 */
public class NotificationInfo extends FeatureInfo {

	static final long serialVersionUID = -6319885418912650856L;

	// ----------------------------------------------------- Instance Variables
	protected final ReadWriteLock notifTypesLock = new ReentrantReadWriteLock();
	protected String notifTypes[] = new String[0];
	/**
	 * The <code>ModelMBeanNotificationInfo</code> object that corresponds
	 * to this <code>NotificationInfo</code> instance.
	 */
	transient MBeanNotificationInfo info = null;

	// ------------------------------------------------------------- Properties

	/**
	 * Override the <code>description</code> property setter.
	 *
	 * @param description The new description
	 */
	@Override
	public void setDescription(String description) {
		super.setDescription(description);
		this.info = null;
	}

	/**
	 * Override the <code>name</code> property setter.
	 *
	 * @param name The new name
	 */
	@Override
	public void setName(String name) {
		super.setName(name);
		this.info = null;
	}

	/**
	 * The set of notification types for this MBean.
	 */
	public String[] getNotifTypes() {
		Lock readLock = notifTypesLock.readLock();
		try {
			readLock.lock();
			return this.notifTypes;
		} finally {
			readLock.unlock();
		}
	}


	// --------------------------------------------------------- Public Methods

	/**
	 * Add a new notification type to the set managed by an MBean.
	 *
	 * @param notifType The new notification type
	 */
	public void addNotifType(String notifType) {

		Lock writeLock = notifTypesLock.writeLock();
		try {
			writeLock.lock();

			String results[] = new String[notifTypes.length + 1];
			System.arraycopy(notifTypes, 0, results, 0, notifTypes.length);
			results[notifTypes.length] = notifType;
			notifTypes = results;
			this.info = null;
		} finally {
			writeLock.unlock();
		}
	}

	/**
	 * Create and return a <code>ModelMBeanNotificationInfo</code> object that
	 * corresponds to the attribute described by this instance.
	 */
	public MBeanNotificationInfo createNotificationInfo() {

		// Return our cached information (if any)
		if (info != null)
			return info;

		// Create and return a new information object
		info = new MBeanNotificationInfo
				(getNotifTypes(), getName(), getDescription());
		//Descriptor descriptor = info.getDescriptor();
		//addFields(descriptor);
		//info.setDescriptor(descriptor);
		return info;

	}

	/**
	 * Return a string representation of this notification descriptor.
	 */
	@Override
	public String toString() {

		StringBuilder sb = new StringBuilder("NotificationInfo[");
		sb.append("name=");
		sb.append(name);
		sb.append(", description=");
		sb.append(description);
		sb.append(", notifTypes=");
		Lock readLock = notifTypesLock.readLock();
		try {
			readLock.lock();
			sb.append(notifTypes.length);
		} finally {
			readLock.unlock();
		}
		sb.append("]");
		return (sb.toString());
	}
}
